Vertex texture fetch, skeleton meshes without animations, Pipeline Tool changes

*Adding support for vertex texture fetch to Windows (Direct3D 11) target. This code should theoretically also work for OpenGL, but it cannot be tested due to the currently-used version of MojoShader not supporting texture fetch instructions in vertex shaders.

*Support for importing skeleton meshes that don't have animations in the file. This is useful for having separate files for the mesh and the animations

*Adding functionality to the Pipeline Tool to add all files from a folder in one step.

*Pipeline Tool shows exception info from MGCB in the output pane

*Propagating some fullscreen flags further down the line (as fullscreen support is not fully implemented, you may want to skip this one)

*You may also want to skip the changes to the references for the Yeti media projects. I found them necessary to compile, iirc.